綠卡5年壹換，換卡時妳必須提供在加拿大居住時間的證據。如果達不到要求的居住時間，就不能得到新的綠卡，即失去移民身份。
Time spent living in Canada
When you are a permanent resident, you can live outside of Canada, but must live in Canada for at least two years in a five-year period. If you live outside of Canada for longer, you may lose your permanent resident status.